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Path: utzoo!watmath!clyde!rutgers!lll-lcc!pyramid!voder!blia!forrest
From: forrest@blia.UUCP
Newsgroups: comp.lang.c
Subject: Re: Help needed ->  fseek() and ftell() in VMS VAX C
Message-ID: <1647@blia.BLI.COM>
Date: Thu, 12-Feb-87 12:23:32 EST
Article-I.D.: blia.1647
Posted: Thu Feb 12 12:23:32 1987
Date-Received: Fri, 13-Feb-87 20:35:33 EST
References: <384@umnd-cs-gw.umnd-cs.UUCP>
Organization: Britton Lee, Los Gatos, CA
Lines: 20
Summary: Watch out for record boundaries

In article <384@umnd-cs-gw.umnd-cs.UUCP>, jwabik@umnd-cs.UUCP (Jeff Wabik) writes:
> I'm trying to fseek my way around a large (1.5MB) file using VAX VMS C,
> and am having absolutely NO LUCK.  
> 

Beware that seeking in non-stream files in VMS doesn't work the
way you'd expect based on Unix experiences. (See page 15-15 of the
"Programming in C" Manual.) If you think about it,
this makes sense for variable length record length files since you
have to know the record length for each record to be able to seek
over it. Although they could have provided a slow method for doing
forward seeking, doing backward seeking would be more trouble
than it's worth. Unix would have the same problem if they used
variable length record files, I believe.

What pisses me off is that seeking also doesn't work right with fixed
length record files. I don't understand the reasoning behind this.

Jon Forrest
ucbvax!mtxinu!blia!forrest